submain | Page 4

submain

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  1. V

    Earthing on a domestic TT supply system with submain, advice needed please

    advice needed please , what is the correct thing to do. The scenario: -meter position and switch fuse @ front of house , with 100mA time delay protecting submain (TT SYSTEM) -the above submain supplies a 17th ED split load DB at back of house (2 x 30mA rcds etc etc) -submain is only 10mm T+E...
  2. G

    kitchen submain

    Hello all, I have a customer who wants to run a submain to a new kitchen. He will then be having 1 x 32 amp ring main, 2 x 32 amp cooker circuits and would also like eventually to add a feed to the garage. Even with diversity I have calculated the total load to be around 65 amps, meaning a 16mm...
  3. J

    swa submain query

    I have been asked to install a db in a wooden outbuilding, the building has been erected on the base of an old garage. There is an old 2 core SWA cable running from the main DB in the house underground coming up in the building I have tested out all the cables and continuity and insulation all...
  4. dez0178

    Help for Submain needed please.

    Hi, I am planning to install a 2 WAY CU in my garage that will feed 1 lighting point and 1 double socket. I am planning to feed the CU 2 in the garage from my CU in the house, from a B20 MCB using SWA 2.5mm. I want to know if I can take the SWA form the CU through the external wall and...
  5. S

    Submain on a TT

    If I'm running a submain on a TT system in SWA then do I need to provide RCD protection for the submain? The cable is 4mm with an approx 30m run buried in the ground. Can I get a 32A switched fuse with 30 ma time delay anywhere? Obvs need to provide discrimination with 30ma RCD in the outbuilding.
  6. A

    Submain cable ideas?

    I have a Job to supply a kitchen with power, the board will be 20m from the main head and will be mainly run surface/trunking and under floors (no insulation), I'm thinking of using either 10/16mm2 t&e all will be rcd protected, but my question is... I have a spool of 6mm2 t&e, could I run a...
  7. P

    C/U Change Submain Problem

    Hi All Im upgrading the mains of my local pub. The board I am changing itself has 6 submains coming out of it in 16mm T&E, where does this leave me in regards to those cables and 30mA protection? Cheers
  8. S

    MCB Submain and RCBO Protected circuits

    Hey guys! I have recently been ask to install a submain to a customers workshop. The installation I was going to use was a 100mA DP Timedelay RCD with a 32A MCB at the supply origin for the SWA submain. In the workshop I was wondering if I can install and DP Isolator with RCBOs to protect the...
  9. M

    Supply to submain no rcd.

    I've been asked to do some minor alterations to an out house which is supplied from CU in main house. Now the new CU in outhouse has RCD protected circuits but the supply from main house is not RCD protected. The cable is a 20m run in hightuf clipped to outside wall clearly visible. Should I put...
  10. E

    Submain Query

    Hi All, Been asker to run a submain 100m metres from origin to a shed. This shed will have a 7.5kw shower, 6kw oven, 2 x 3kw water heaters as well as general power and lighting(not much about 12 lights & 12 twin sockets) Not sure if running 3 phase supply would make more sense? Financially and...
  11. T

    Submain with no isolation

    Hi guys, Im doing an eicr on a commercial site (offices) and have found 2 3phase db's fed strait from the main intake busbar. 1 run is only 2metres clipped direct armoured 35mm 4c And 1 is 8m clipped direct above ceiling tiles armoured 25mm 4c Am i right in saying they need a fused isolator...
  12. A

    Electrical submain schematic

    I carry out a lot of EICRs for councils, mainly on high schools & similar containing in excess of 80 DBs. As part of the job, they request that I provide them with a schematic showing the main panel at source, then all submains and DBs in the installation. Does anyone know of any software that...
  13. P

    double up on swa submain

    recently had a test with 2 cables being used for sub main 1st is a 10mm swa 2 core with armourings for earth 2nd is a 6mm swa 3 core with armour and integral earth both cables doubled up on MCCB 63 a breaker and both terminated in DB what code i think 2 ive told them its grim and needs 1...
  14. K

    concentric cable submain

    just quoting on a job which involves some alterations. the property is a new build block of 12 x flats (2008), each supplied with 16mm concentric cable, 60A Main switch fuse at meter position, no RCD protection and unsure on installation method etc. The property will be converted to a 'care in...
  15. J

    RCBO instead of switchfuse for submain?

    I haven't seen this job yet (going in morning) but apparently the customer's builder has found that the majority of cables for upstairs circuits have been pulled through past a metal joist and it's skinned a few of them, their re-wire about 10yrs ago was a complete shocker so I'm not surprised...
  16. B

    110 metre submain for 4/5 bed new build?

    What size swa would be needed for a 4/5 bed new build property submain burried direct in ground?
  17. P

    RCD Protection on 16mm Submain??

    Hi all House C/U is in the kitchen, come off the mains blocks into a KMF isolator then across above the plasterboard ceiling about 15m in 16mm T&E into the the new granny annex C/U. This is the way I have always done it, depending on the circumstances. If it was SWA I wouldn't be having this...
  18. T

    EIC or EICR for submain after new Consumer Unit?

    Hi everyone. I have my Elecsa assessment soon and have just replaced my own consumer unit, along with upgrading the bonding, rerouted cables which weren't in "safe zones" etc. I have filled in an EIC and literally gone over my house with a fine tooth-comb to make sure everything is spot-on. I...
  19. D

    16 mm t+e feeding submain

    Hi all. been to look at a job where power is required for a garage. need to go back and take a second look. but on first visit i noticed a fully loaded second consumer unit in the kitchen feeding a number of circuits,from a main consumer unit next to the dno cutout feed with 16 mm t+e. i'm...
  20. B

    SWA submain into plastic consumer unit?

    What options do i have for terminating a 16mm 3 core swa into a plastic consumer unit?

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